<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon>
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
        </el-col>
        <el-col>
          <!-- 选择商品分类的级联选择框 -->
            <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
            popper-class="cate-cascader">
            </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true">
            添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table
            :data="manyTableData"
            border
            stripe>
            <!-- 展开行区域 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染 tag 标签 -->
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals" :key="i"
                  closable
                  @close="handleClosed(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                 getGoodsList="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>

            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                {{scope.row.id}}
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only" >
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true">
            添加属性
          </el-button>
          <!-- 静态属性表格 -->
          <el-table
            :data="onlyTableData"
            border
            stripe>
            <!-- 展开行区域 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染 tag 标签 -->
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals" :key="i"
                  closable
                  @close="handleClosed(i,scope.row)">
                  {{item}}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>

            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                {{scope.row.id}}
              </template>
            </el-table-column>
        </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加动态参数或静态属性的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <!-- 表单区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改动态参数或静态属性的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <!-- 表单区域 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="eidtParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框配置对象
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 级联选择框绑定数组
      selectedCateKeys: [],
      // 被激活页签名
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 控制添加属性对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加参数的表单验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改属性对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 修改参数的表单验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        this.$message.error('获取商品分类数据失败！')
      }

      this.catelist = res.data
    },
    // 监听级联选择框选中项
    handleChange() {
      this.getParamsData()
    },
    // 监听tab 页签点击事件
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的id,和当前所处的面部，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }

      res.data.forEach(item => {
        // 解析参数具体值为数组
        item.attr_vals = item.attr_vals === '' ? [] : item.attr_vals.split(' ')
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return

        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
          { attr_name: this.addForm.attr_name, attr_sel: this.activeName })

        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功!')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attrId) {
      // 查询当前参数信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: { attr_sel: this.activeName }
      })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }

      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    eidtParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败！')
        }

        this.$message.success('修改参数信息成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 删除参数
    async removeParams(attrId) {
      // 询问
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除！')
      }

      // 请求删除
      const { data: res } = await
      this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 监听文本框失去焦点后按下 Enter 事件
    async handleInputConfirm(paramRow) {
      if (paramRow.inputValue.trim().length === 0) {
        paramRow.inputValue = ''
        paramRow.inputVisible = false
        return
      }
      paramRow.attr_vals.push(paramRow.inputValue.trim())
      paramRow.inputValue = ''
      paramRow.inputVisible = false
      // 提交操作
      this.saveAttrVals(paramRow)
    },
    // 将对 attr_vals 的操作提交
    async saveAttrVals(paramRow) {
      // 发起请求
      // TODO:可能有并发场景下不同步的问题，或许可以获取最新数据再提交修改
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${paramRow.attr_id}`, {
        attr_name: paramRow.attr_name,
        attr_sel: paramRow.attr_sel,
        attr_vals: paramRow.attr_vals.join(' ')
      })

      if (res.meta.status !== 200) {
        this.$message.error('修改参数项失败！')
      }

      this.$message.success('修改参属项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(paramRow) {
      paramRow.inputVisible = true
      // 文本框自动获取焦点
      // $nextTick 当页面元素重新渲染后，再执行回调
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 点击参数项关闭按钮，进行删除操作
    handleClosed(i, paramRow) {
      paramRow.attr_vals.splice(i, 1)
      this.saveAttrVals(paramRow)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的 id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算对话框标题文本
    titleText() {
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt{
  margin-top: 15px;
}

.el-tag{
  margin: 10px;
}

.input-new-tag{
  width: 120px;
}
</style>
